scsi: libfc: trivial: Fix spelling mistake of 'discovery'

This is my fault (can't even blame copy/paste).

Link: https://lore.kernel.org/r/20200713074645.126138-4-lee.jones@linaro.org
Cc: Hannes Reinecke <hare@suse.de>
Reported-by: Johannes Thumshirn <Johannes.Thumshirn@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/libfc/fc_disc.c

@@ -370,7 +370,7 @@ static void fc_disc_gpn_ft_req(struct fc_disc *disc)
 
 /**
  * fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response.
- * @disc:  The descovery context
+ * @disc:  The discovery context
  * @buf:   The GPN_FT response buffer
  * @len:   The size of response buffer
  *